Talking about your ex in the first hour
Even if the framing is positive. Even if it's just a funny anecdote. Even if you're using it to make a larger point about what you've learned. Bringing your ex into the first hour of a first date moves the spotlight onto someone who isn't there and signals to your date that a significant portion of your mental furniture still belongs to someone else. They're not wrong to notice. The mention of an ex, however breezy, raises a question that shouldn't need to be raised: are you actually available? This doesn't mean you need to pretend your romantic history doesn't exist. It means the first date is not the venue for processing it. The person across from you deserves the version of you that's fully in the room, fully interested in what's unfolding right now. Ex-talk can come later, when it has context, when you've established enough trust that the conversation can hold that weight without tipping. On a first date, keep the spotlight where it belongs: on the two of you, and what you're finding out about each other.